CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources
astro-ph.HE
/ Authors
The CHIME/FRB Collaboration, :, Bridget C. Andersen, Kevin Bandura, Mohit Bhardwaj, P. J. Boyle, Charanjot Brar, Tomas Cassanelli, S. Chatterjee, Pragya Chawla
and 50 more authors
Amanda M. Cook, Alice P. Curtin, Matt Dobbs, Fengqiu Adam Dong, Jakob T. Faber, Mateus Fandino, Emmanuel Fonseca, B. M. Gaensler, Utkarsh Giri, Antonio Herrera-Martin, Alex S. Hill, Adaeze Ibik, Alexander Josephy, Jane F. Kaczmarek, Zarif Kader, Victoria Kaspi, T. L. Landecker, Adam E. Lanman, Mattias Lazda, Calvin Leung, Hsiu-Hsien Lin, Kiyoshi W. Masui, Ryan Mckinven
/ Abstract
We present the discovery of 25 new repeating fast radio burst (FRB) sources found among CHIME/FRB events detected between 2019 September 30 and 2021 May 1. The sources were found using a new clustering algorithm that looks for multiple events co-located on the sky having similar dispersion measures (DMs). The new repeaters have DMs ranging from $\sim$220 pc cm$^{-3}$ to $\sim$1700 pc cm$^{-3}$, and include sources having exhibited as few as two bursts to as many as twelve. We report a statistically significant difference in both the DM and extragalactic DM (eDM) distributions between repeating and apparently nonrepeating sources, with repeaters having lower mean DM and eDM, and we discuss the implications. We find no clear bimodality between the repetition rates of repeaters and upper limits on repetition from apparently nonrepeating sources after correcting for sensitivity and exposure effects, although some active repeating sources stand out as anomalous. We measure the repeater fraction over time and find that it tends to an equilibrium of $2.6_{-2.6}^{+2.9}$% over our total time-on-sky thus far. We also report on 14 more sources which are promising repeating FRB candidates and which merit follow-up observations for confirmation.